云服务器和云数据库有什么不同

# 安装Node.js和Nginx
sudo apt update
sudo apt install -y nodejs npm nginx

# 创建一个简单的Node.js应用
mkdir myapp
cd myapp
npm init -y
npm install express
echo 'const express = require("express"); const app = express(); app.get("/", (req, res) => res.send("Hello World!")); app.listen(3000, () => console.log("Server running on port 3000"));' > index.js

# 配置Nginx反向代理
echo 'server { listen 80; server_name yourdomain.com; location / { proxy_pass http://localhost:3000; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; } }' > /etc/nginx/sites-available/default
sudo systemctl restart nginx

# 启动Node.js应用
node index.js

const { MongoClient } = require('mongodb');

async function main() {
  const uri = "your_mongodb_cloud_uri";
  const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

  try {
    await client.connect();
    const database = client.db('mydb');
    const collection = database.collection('mycollection');

    const result = await collection.insertOne({ name: "John Doe", age: 30 });
    console.log(`New document inserted with _id: ${result.insertedId}`);
  } finally {
    await client.close();
  }
}

main().catch(console.error);